tcp-dctcp.h

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/*
 * Copyright (c) 2017 NITK Surathkal
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Shravya K.S. <shravya.ks0@gmail.com>
 *
 */
 
#ifndef TCP_DCTCP_H
#define TCP_DCTCP_H
 
#include "ns3/tcp-congestion-ops.h"
#include "ns3/tcp-linux-reno.h"
#include "ns3/traced-callback.h"
 
namespace ns3
{
 
class TcpDctcp : public TcpLinuxReno
{
  public:
    static TypeId GetTypeId();
 
    TcpDctcp();
 
    TcpDctcp(const TcpDctcp& sock);
 
    ~TcpDctcp() override;
 
    // Documented in base class
    std::string GetName() const override;
 
    void Init(Ptr<TcpSocketState> tcb) override;
 
    typedef void (*CongestionEstimateTracedCallback)(uint32_t bytesAcked,
                                                     uint32_t bytesMarked,
                                                     double alpha);
 
    // Documented in base class
    uint32_t GetSsThresh(Ptr<const TcpSocketState> tcb, uint32_t bytesInFlight) override;
    Ptr<TcpCongestionOps> Fork() override;
    void PktsAcked(Ptr<TcpSocketState> tcb, uint32_t segmentsAcked, const Time& rtt) override;
    void CwndEvent(Ptr<TcpSocketState> tcb, const TcpSocketState::TcpCAEvent_t event) override;
 
  private:
    void CeState0to1(Ptr<TcpSocketState> tcb);
 
    void CeState1to0(Ptr<TcpSocketState> tcb);
 
    void UpdateAckReserved(Ptr<TcpSocketState> tcb, const TcpSocketState::TcpCAEvent_t event);
 
    void Reset(Ptr<TcpSocketState> tcb);
 
    void InitializeDctcpAlpha(double alpha);
 
    uint32_t m_ackedBytesEcn;       
    uint32_t m_ackedBytesTotal;     
    SequenceNumber32 m_priorRcvNxt; 
    bool m_priorRcvNxtFlag; 
    double m_alpha;         
    SequenceNumber32
        m_nextSeq;      
    bool m_nextSeqFlag; 
    bool m_ceState;     
    bool m_delayedAckReserved; 
    double m_g;                
    bool m_useEct0;            
    bool m_initialized;        
    TracedCallback<uint32_t, uint32_t, double> m_traceCongestionEstimate;
};
 
} // namespace ns3
 
#endif /* TCP_DCTCP_H */